PEP8
Allow to use the Nginx Upload Module

Nginx users can use the upload-module to efficiently upload files to
Flaskup. The Nginx configuration must be updated to use this module.
http://wiki.nginx.org/HttpUploadModule

No configuration on the Flaskup side is required. Flaskup will check for
two POST parameters (`myfile.name` and `myfile.path`) if there is no regular
uploaded file.
Update README.rst

Add a paragraph about the Nginx upload-module.
Some text formatting.
Update README.rst

Minor changes in the README file.
Add the CHANGELOG file
Git ignore the build/ folder
More robust check of the uploaded file presence
Do not use alert() to display errors

Errors are now displayed in a specific div instead of using alert().
This brings more consistent error displaying between javascript and
non-javascript errors.
Only display the modal window if the upload starts
Update translations
Untrack the run-server.py script
Update the CHANGELOG file
Add security checks when using Nginx upload-module

You must now specify in the configuration that you are using the Nginx
upload-module (it is no more automatically detected).
The store of the upload-module must also be specified to deny moving
files outside of the store (for example, if a malicious user forge a
POST request with `myfile.path=/etc/password`).
Update README.rst
Version 0.2